Team Losi JRX-2 User manual

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OWNER 'S GUIDE
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Carefullyread through allinstructions
thoroUJ}hly to familiarize yourself with
the parts andconstruction techniques
usedin thisrace car.
As you read
through.
also pay close attention to the
overalldesign of the car. Remember,
beingcompetitive is a measure
of the
patience
you put into the construction of
the race car. Take yourtime andpay
close attention to the details.
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16 55 E. MISSION BLVD ., POMONA, CA 91766 , (7 14 )620·0164
• scan courtesy ofVintagelosi.
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Welcome JRX-2 Owner!!
Winning races gets harder all the time. The competition is incredible. To be competitive
you need the best equipment available.
We have been testing and refining the JRX-2 for
over 2 1/2 years and I feel it has the right combination out of the box to be race ready.
All of the drivers that have done our testing have consistently gone faster with the JRX-2.
am sure you will attain the same results. -
I would like to thank my Dad for not compromising when it came to tooling or the extra
costs for the best materials and parts available. Also, thanks
to our engineering staff for put-
ting up with my demands. Last, but not least, Ron Rossetti and Jack Johnson, you are the
bestl
Thank You for purchasing the JRX-2
·h. •
Gil Losi Jr .
P.S .
Please return the registration card enclosed in your kit so we can share everything
we learn
in the future. scan courtesy ofVintagelosi.com
1. Introduction
The JRX-2 kit is composed of different bags
marked Bag A through Bag
F. Each bag contains
all of the parts ne cessary to complete a certain
section
of the car. It is essential that yo u open
only one bag at a time and follow the rig ht se-
quence, otherwise you will face difficulties in
finding the right part. It is helpful to read the en-
tire instructions for the bag prior to starting as-
sembly. Key numbers (in circles) have been
assigned
to each part and remain the same in
the illustration and throughout the intructions.
For your convenience, an actual size hardware
Identification guide
is included in Appendix A of
the manual. To check a part, hold it against the
silhouette until it is identified. In some cases
extra hardware has been supplied to replace
easily lost parts. When assembling shafts
to plas-
tic parts, different fits e.g., press, net, loose
have been designed into the parts. To ensure
that parts are not lost during construction, it is
suggested that you work over a towel or mat
to
prevent the parts from rolling away.
IMPORTANT SAFETY NOTES
1. Select an area for assembly that Is away from
reach of small children. The parts are small and
can be swallowed by children causing choking
and possible Internal injuries.
2. The shock fluids and grease supplied should
be kept out of childrens reach. They are not
toxic, but were not intended
for human consump-
tion.
.
3. Exercise care when using any hand tools,
sharp instruments and power tools during coo-
struction.
4. Carefully read all manufacture warnings and
cautions
for any glues or paints that may be
used for assembly purposes.

Introduction (cont.)
TOOLS REQUIRED
Team Losi has supplied all allen wrenches and a
special wrench that
is needed for assembly and
adjustments. The following common
to ols will
also be required: #2 Phillips screw driver, small
flatblade screw driver, needle nose pliers,
regular pliers, scissors or other body c ut -
ting/trimming tool. 3/16",1/4
", and 3/8" nut
drivers are optio
na l.
RADIO/ELECTRICAL
The JRX-2 is an out of the box high performance
race car.
It is f or this reason that we have not in-
cluded specific instructions on radio and electri-
cal equipment installation. We have left this
subject to the personal preference
of the owner.
racer. A suggested layout
is provided in this
manual.
If you have any further questions, your
high performance R/C center will be able
to
answer any of your questions.
HARDWARE IDENTIFICATION
When in question, use the hardware identification
guide
in Appenix-A. For screws, the prefix num-
ber designates the screw size and number
threads per inch e.g
., 4-40 is a #4 screw with 40
threads per inch. The fraction following desig-
nates length of thread or overall
if flathead type.
Bearings are referenced by inside diameter x out-
side diameter. Shafts and pins are diameter x
le ngth. Washers are described by inside
diameter. E-clips are sized by the shaft diameter
of attachment.
Table of Contents
1. INTRODUCTION
Front Suspension Assembly (cont .) ...... 15
Important Safety Notes .......... .............. i
Illu st ra tion-Front Suspension ............... 16
Tools Required .................................. ii 6.
SHOCKS-BAG E
Hardware Identification .. ... . .. ............... ii
Shock Assembly ...... ..... ... .......... .. . ..... 17
Bad io / Eiectrical ............................ ..... ii
lllustation -S hocks .............................. 18
Table of Conten ts ........................... . ... ii
Shoc k Attachment .............................. 19
2. CHASSIS-BAG A 7. WING, BODY, GEAR
COV ER
Chassis Assembly .............................. 1
Illustration- Trimming ...................... . ... 20
C hass is Assembly (c ont.) .................... 2 8. WHEELS & TIRES-
BAG F
C hassis Assembly (con t.) ........ . .. . ........ 3
Assembly & Attachment ...................... 22
Illustration -C hassis Assembled ............. 4 9.
FINAL ASSEMBLY-BAG G
3.
GEARBOX / DIFFERENTIAL-BAG B
Wing Buttons ...................... ...... ........ 21
Part 1 Differential Assembly ..............•.. 5
Final Assemb ly & Body Painting . .......... 23
Part 2 Gearbox Assembly . ... .. . .............. 6
10. ELECTRICAL/ELECTRONICS
Illustration-Exploded Gearbox ............. .7 S
uggest ed Layout .......................... . ... 24
Part 2 Geabox Assembly ( cont.) ..... .... ... 8
11 . TUNING TIPS FROM GIL LOSI JR .
4. REAR
SUSPENSION -B AG C
Gearbox , Different ia l, Fro nt End Adj ..... 25
Rear Suspension Assemb ly ............ ... . ... 9
Springs, Tires , Gearing , Shocks .......... 26
Rear Suspension Assembly (cont .) .. .. .. ... 10
Illu s tration -Ca mber , Toe In / Toe Out. ...... 27
Rear Suspension As . seipbly (cont .) ........ . 11
Rear Suspension Assembly (cont .) ....... .. 12
APPENDIX A- Hardwar e Identification Guide
Illustration - Bear Suspension ................. 13
5.
FRONT SUSPENSION-BAG D
SPARE PARTS LIST
Front Suspension Assembly .................. 14
sc an courtesy ofVintagelosi.com
ii

2. Chassis Assembly-Bag A
1. locate and open Bag A.
2. Secure side bulkheads (6) to sides of chassis
using
four 4-40 X 3/8" flathead screws (7). Fig.1
3. Secure
two aluminum steering posts (13) to
chassis (4) using two 4-40 X 3/8" flathead screws
(
7) . Fig 2
4. Secure front shock tower {1) to front bulkhead
{2) using two 4-40 X 3/8" socket head screws
(3). Fig.3
Page 1
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FIG. 1
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FIG. 2
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FIG. 3

Chassis Assembly-Bag A (cont.)
5. Insert wing tubes (8) into top of rear bulkhead
{
9) as illustrated. *Note: These are a tight press
fit.
6. Secure rear
shock tower (10) to front of rear
bulkhead
(9) using four 4-40 x 3/8" socket head
screws (3).
7. Secure rear bulkhead {9)
to chassis (4) using
two 4-40 x 3/8" flathead screws ( 7) in front and
two 8-32 x 1/Z' flathead aluminum screws ( 11 ) in
the rear
Page 2
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FIG. 4

Chassis Assembly-Bag A (cont.)
8. Secure front bulkhead (2) to front of chassis
(4) using four 8-32 X 3/8" long flathead
aluminum
sc rews (5 ). Fig .S
9. Secure battery holder ( 12 ) to chassis ( 4)
using four 8-32 X 1/Z' flathead aluminum screws
(11 ). Fig.6
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10. Secure antenna mount (1 4) to right hand side
of chassis as illustrated with a 4-40 X 3/8"
flathead screw (7). Fig.7
11 . Snap antenna cap (112) onto antenna mount.
Fig. 7
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Page 3
FIG. 5
FIG. 6
s
FIG. 7

Chassis Assembled
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Page 4

3. Part 1-Differential Assembly-Bag B
1. lo cate and open Bag B. Remove small inner
bag containing differential parts and set
remainder
of parts aside for now .
2. locate small white grease container {15) and
open.
3. Locate differential gear {16) from small bag.
Fig.8
4. Using small instrument such as a toothpick
or
precision screwdriver, carefully dab a minute
amount
of grease into each bearing hole of the
gear. Keep grease away from gear teeth. Fig.8
FIG. 9
5. Press small ball bearings (17) into greased
holes
of differential gear (16). Flg.8
6. Insert 1/4" X 3/8" bearing (18) into female half
of differential ( 19 ). Fig.9
7. Insert locknut
(20) into opposite side of
female differential half ( 19) . Fig.9
8. Locate 5-4() X 3/4" button head screw (21) and
build thrust assembly in the following order: Flg.9
a. slide three opposing bellville washers (22) on
screw.
* Note-Bellvilles are slightly coned.
b. one small thrust washer {23)
c. one 5-ball thrust bearing (24)
• Note-Apply liberal amount
of grease to this
part.
d. one small thrust washer (23)
e. Set aside until Step 13.
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20
FIG. 8
9. Place one hex thrust washer (25) on male half
of differential (26). Fig.9
10. Place center differential gear on male half of
differential (26) over hex thrust washer (25). Flg.9
11 . Place one hex thrust washer (25) on female
half
of differential gear ( 19 ). Fig.9
12 . Insert male half of differential gear (26) into
bearing
in female half of differential ( 19) . Fig.9
13. Insert thrust washer screw assembly (from
step
8) into male half of differential (2 6) and
screw into female half slowly, rotating differen-
tial halves
to properly seat parts. DO NOT OVER-
TIGHTEN AS DAMAGE TO THE THRUST
ASSEMBLY
CAN OCCUR . Fig .9
14. Insert a 5/16" x 1/2 ' bearing (101 ) into into
each end of differential assembly. Fig.9
15 . Set differential aside until step 11 in part 2,
Bag B.
Page 5

Pa rt 2-Gearbox Assembly-Bag 8 (cont.)
1. Remove remaining parts from lar ge Bag B.
2. Install 3/16" X 3/8'' bearing (27) into upper
bearing seat
of the left half of gearbox (28).
Fig.10
3. Install two Smm x 14 mm beari ngs (29) i nto
lower bearing seats of the left half of gearbox
(28). Fig.9
4. Repeat steps 2 and 3 with the r
ight side of
gearbox (30).
5. Install output gear {31) into lower bearing seat
of left half of gearbox {28). Fig.12
6. Slide outdrive spacer {107) onto U-joint out-
dr ive with the flat side away from U-joint. Fig. 12
7. Install U-joint outdr ive (32) into outside lower
bearing seat
of left half of gearbox {28) and turn
until interlocked with output gear
(31 ). Fig.12
8. Secure the two toget her with a 4-40 X 1/ 2"
socket head screw (33) threaded through the U-
joint outdrive (32) into the ouput gear (31 ). Fig.12
9. Repeat Steps 5-8 with the right half of gear-
box {30). Fig.12
10 . Attach two large 3/16" E-clips (5 4) to pinion
shaft assembly (46). Fig.
11
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FIG. 11
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, FIG. 10
11 . Slide long side of p inion shaft assembly (46)
through
top bearing (27) in the right half of gear-
box (30). Fig. 12
12. Install differential assembly made in Fig. 9 in
ri
ght half of gearbox {30). Locate on boss
provided. Make sure the adjusting screw
(2 1) in
the differential assembly is facing outward so it
accessible for adjusting. Fig.12
13. Assemble the
right and left gearbox halves
together. Fig.
12
14. Position assembled gearbox against motor
plate (47). Attach
to motor plate (47) using three
4-40 X 1 3/ 8" socket head screws (48). NOTE:
Do not use the upper forward hole at this time.
Fig.12
15. Insert 3/
32! ' X 1/2" pin ( 41 ) into hole in pinion
sha lt (46). Press spur gear (49) onto pinion shaft
(46) carefully aligning pin ( 41 ) with groove in
spur gear (49). Secure gear with 3/16" E;clip
(54). Fig.12
Pa ge 6

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Exploded Gearbox
Page 7
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FIG. 12

Part 2-Gearbox Assembly-Bag B (cont.)
16. Install 3/ 32! ' x 1/Z' pin (41) into pinned ball
(39) joint so that it extends out evenly on both
sides
of ball. Fig. 13
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17 . Wedge one 3/3Z' x 1/Z' cross p in (41) into
one hole
of the female drive shaft U-jolnt ( 50) .
Fig.14
18 . Using rounded end of the TEAM LOSI
wrench supplied with kit, pry the opposite end of
3/ 32! ' x 1/Z' cross pin (41) Into remaining hole in
the drive shaft U-jo int (50). Fig.14
19 . Using remaining cross pin (41) in universal
pivot (39) repeat this procedure to connect dr iv e
shaft (
50) to outdrive U-joint (32). Fig. 14
20. While holding rear pivot support ( 51) in
place under rear of gearbox, slide gearbox as-
sembly into rear of rear bulkhead (9).Fig. 15
21 . Secure gearbox and rear pivot support to
chassis (4) using four 8-
32 x 1/Z' flathead
screws (11). Fig.15
22. Secure motorplate (47)
to chassis using a 4-
40 x 1/4" flathead screw (105). Fig .1 5
23. Lock gearbox to rear bulkhead using a 4-40
x 1 3/4" socket head screw (5 3) with a #4
washer (
109 ) under the head. Fig.15
* NO TE : A 4-40. Nylon nu t ( 88) will be attached
later
to secure the gear cover, Along with the 4-
40 x 1/8" button head screw included in th is kit.
Fig.37 Page 8
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FIG.13
FIG. 15

4. Rear Suspension Assembly-Bag C
1. Locate and open Bag C.
2. Install 3/8" studded ball joint (3 4) pointing
rea rward in top outside hole of rear bulkhead (9)
as shown. Fig.16
3. Slide on one 1/4" ball (36) over one 4-40 X
1/2" socket head screw (33). This will create
o
ne composite ball joint. Fig. 17
4. Repeat step 3 three more times.
5. Thread one compos ite ball joint into top ho le
in side bulkhead (6) so that the ball is on the out-
side and it can just
spin freely. Fig .1 7
6. Repeat step 6 using the bottom hole in side
bulkhead ( 6) as shown. Fig.17
7. Thread one composite ball joint into
top for-
ward hole in
hub carrier (35) so that the ball is
on the inside and it can just spin freely. * Note:
Hubs are
non directional. Fig. 18
8. Repeat step 7 using lowest hole on hub car-
rier (
35) as shown. Fig.18
9. Install 3/8" studded ball joint (3 4) in topmost
hole pointing forward in
hub carrier (35). Fig. 18
Page 9
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FIG.16
FIG.
17
FIG. 18

Rear Suspension Assembly-Bag C (cont.)
10. Secure shock mount (37) to front of top
corner hole in rear shock tower ( 10 ) using a 4-
40 X 3/4" socket head screw (38) threaded from
rear
of shock tower to front. Fig. 19
11 . Place universal pivot ( 39) In rear axle (40)
so that cross pin hole is aligned vertically. Fig.20
12 . Using pliers, push 3/ 32 dia. pin (41) through
axle (
40 ) and universal pivot ( 39 ) until pin ex-
tends out evenly on both sides
of axle (40). Be
sure there is no binding
of universal pivot (39) in-
side U-jolnt (40). Fig.
20
13 . Pry universal pivot (39) into male section
(
42 ) of drive shaft using Fig. 14 in Bag B as a
reference.
14 . Insert two 3/16 X 3/8 X 1/8" bearings (27)
into either side
of central hole in hub carrier
(3 5). Fig. 21
15 . Slide axle shaft (40) through central hole in
hub ( 35) as shown. Fig .21
16. Slide spacer washer (44) down axle (4 0)
shaft and up ag ainst bearing (27). Fig.21
17 . Secu re shaft by sliding 1/16" pin (45) into
through hole in axle shaft (
40 ) as shown. Flg.21Page 10
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FIG. 19
FIG. 20
FIG.
21

Rear Suspension Assembly-Bag C (cont.)
® ®
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18. Slide 1/8 X 1.785 hinge pin (55) through
hole in rear pivot support (5 1) f rom rear to front.
Fig.22
19. Once forward end
of pin {55) is loc ated half
way between pivot support {51) and r~ar
bulkhead (9), slide one end of link (56) down pin
(55) to front of pivot support (51). Fig.22
20. Place 1/8" E-clip (57) on forward groove in
pin (55). Fig.
21. Slide one end
of link (56) down hinge pin
{55) and
up against 1/8" E-clip {57). Fig.22
22 . Slide hinge pin (55) into rear bulkhead (9)
so link (56) is secured between 1/8" E-clip (57)
and rear bulkhead {9). Fig.22
23. Place second 1/8" E-clip (57) on rear
groove
in hinge pin (55) so that link (56) is lo-
cated between front of pivot support and rear
1/8" E-clip (57). Fig.22
® ®
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FIG. 22
24. Al ign splines and gr ooves of drive shaft hal-
ves. Slide male sec ti on (42) of drive sha ft in to
the female section (50) that is attached to gear
box. Fig.23
25. Taking care
not to separate t he drive sha ft ,
align the free ends of the links (56) on either
side of the hub
{35) with the hole run ni ng
through the
hub {35) just below the rear axle
{40). Fig.23
26. Slide 1/8 X 1.420" hinge pin (58) t
hr ou gh
links (56) and hub. Secure bot h ends with 1/8" E-
cl
ips {57). Check for freedom of travel. Fig.23
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Page 11
FIG. 23

Rear Suspension Assembly-Bag C (cont.)
27 . Snap on one end of upper trailing link (59)
on
to upper ball joi nt (36) in side bulkhead. Fig.24
28. Snap free end of upper trailing link (59)
onto
up per ball jo int in hub (35). Fig.24
29. Orient lower link ( 60 ) so rib is on bottom
and shock mount holes are towards rear. Fig.24
30. Snap forward end of lower link (60) o nt o
lower ball joint (36) in side bulkhead (6). Fig .2 4
31 . Snap rear end of lower link (60) onto lower
ball
jo int (36) in hub carrier (3 5) . Assure
freedom
of movement Fig.24
32 . Thread an adjustable rod end (61) onto
each end
of a 1 1/8" turnbuckle (62) taking care
to note one side of turnbuckle has left hand
thread
s. Fig.25
33. Snap one adjustable rod end (61) onto the
ball joint (34) pointing towards the rear and
secured
to the rear bulkhead (9). Fig.26
34. Snap free rod end onto topmost ball joint
(3 4) pointing forward from the hub carrier (35).
Fig.26
35. Refer to Tuning Tips for Camber adjustment.
36.
REPEAT THESE INSTRUCTION FOR OP-
POSITE SIDE
OF C AR . Page 12
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FIG. 24
FIG. 25
FIG. 26

Exploded Rear Suspension
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FIG.37

5. Front Suspension Assembly-Bag D
1. Locate and open Bag D.
2. Attach one 3/ 16 " studded ball joint ( 63 ) and
studded ball washers (64) in both ends
of steer-
ing sector arm (65) as shown. Fig.27
3. Install the 3/8" studded ball (34) into the smal-
lest hole on the servo saver (66). Attach the
servo saver (66)
to the steering sector arm (65)
using a 4-40 X 1/8" shoulder screw (67). *NOTE:
shoulder screw should turn freely in servo saver.
Fig.
27
4. Attach the idler arm (68) to the remaining
hole on the steering sector arm (65) using a 4-
40 X 1/8" shoulder screw (67). Fig. 27
5. Slide servo saver (66), idler arm (68), and
steering assembly, down onto steering posts
(
13 ) and secure with two 3/1f/' E-clips ( 54 ).
Fig.
27
6. Attach the A-arms ( 69) with the shock mount-
ings forward
to the front bulkhead (2) using the
1/8" X 1.650" hinge pin (70) as shown. Secure
with
two 1/8" E-clips (57). Fig.28
7. Attach the spindle carrier (71) to the A-arm
(69) with the main body pointing upward using a
1/8" X .960 hinge pin (72) as shown. Secure with
two 1/8" E-clips (57). Fig.29
•
Page 14
.....
FIG. 27
.....
FIG. 28
.....
.....
.....
.....
FIG. 29

Front Suspension Assembly-Bag D (cont.}
8. Slide front axle (73) into large hole in spindle
(74 & 103), as shown making sure king
pin holes
are aligned vertically. *NOTE: the spindles are
marked left (103) &
right (74). Fig.30
9. Attach spindle assembly (74)
to the spindle
carrier (71) using a 1/8" X .690 hinge king
pin
(75). Secure with two 1/8" E-clips (57). *NOTE:
Letter R & L should face up on spindle arm.
Fig.30
10. Thread a 3/8" studded ball (34)
into the to p
of the spin dle carrier (71). Thread a 3/ 16' '
studded ball (63) into each spin dle arm (74 &
103). Fig.30
11. Thread an adjustable rod end (61) onto
each end of the 1 1/ 2' ' turnbuckle( 106). *Note:
One end of turnbuckle has lett hand threads.
Repeat this step with another 1 1/
2" turnbuck le
(106). Fig.25
12. Snap one rod end (61)
onto end of steer ing
sector arm (65) and free end onto steering
spindle arm (74). Fig.31
13. Snap one end
of the other tu r nbuckle as-
sembly (106) onto top of spindle carrier (71) and
the
other end onto lower near corner of shock
tower (1). Fig.(31)
14. Thread one 3/16" studded ball (63)
pointing
rearward into lower near corner of shock tower
(1). Secure with 4-40 n
ut (110) Fig.32
15. Mount shockmount (37) onto inside top
corner hole pointi ng forward in shock tower (1)
using 4-40 X 3/4" screw (38) as shown. Fig.32 Page 15
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FIG. 30
FIG. 31
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FIG. 32

Exploded Front Suspension
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FIG. 34

6. Shock Assembly-Bag E
1. Snap 1/8" E-clip (57) on shock shaft [rear
(7 6) , front (84)) into groove closest to threads.
2. Slide piston (77) onto shaft from grooved end
until it rests against E-clip (57).
3. Secure piston (77)
in place with another E-clip
(57).
4. Slide shock cartridge (78) over threaded end
and down shaft [rear (76), front (84)] with hex
end toward threads
on shaft until rounded end
contacts 1/8" E-clip (57).
5. Fill the shock body [front (80), rear (85)] with
shock oi l (7 9) level to the bottom of threads.
6. Slide shaft assembly, piston first, into shock
body [front (8 0), rear (85)].
7. Slowly screw cartridge (78) into shock body
[front (80), rear (85)) allowing excess
oil to
bleed past threads. Tighten to assure proper
seal.
8. Assure freedom of movement of piston.
9. FRONT SHOCKS ONLY -Press shockmount
ball (36) into ball mount (86) and slide ball
mount into shock cup (87). This will create a
lower front shock mount.
10 . Carefully grasp shock shaft [rear {76), front
(84)) with pliers (insulate with rag to prevent
scoring shaft) and thread into lower shock mount
[rear (81), front (86)].
11. Slide spring (rear (82), front (1 04)) over
shock body [rear (85), front (80)) to rest on
lower shock mount (rear (8 1) , front (86).
12 . Insert 4-40 X 3/8" socket head screw (3) into
larger clamp hole of the shock collar (83) and
thread
into small hole.
13 . With the collar unclamped, slide it down over
top of shock body (front (80) , rear (85)] and
onto spring [rear (82), front (104)].
14. Compress spring, rear (82), front (104), ap-
proximately 1/4" and secure in place by tighten-
ing collar screw (3).
15 . Assure freedom of movement of piston.
See Fig. 33 on page 18
Page 17